Sorting arrays by year

I have a workbook with about 10 worksheets. Each worksheet represents a different piece of equipment. We routinely test each piece of equipment for microbial contamination. Each sample is coded to match the result to a specific piece of equipment. We have over 4000 data points from 3 different years: 2014, 2015, 2016. All data for all equipment is posted on one main spreadsheet. Based upon the sample code (a 22 character value) the result is copied onto the respective equipment's spreadsheet. Because of this, there are many blanks in the results column on each sheet. I use the COUNT function to determine the number of results by year. I want to have columns on each sheet that lists the individual results by year for the specific piece of equipment without blanks. We perform statistical analysis of the data by year to establish trends. I have managed to get all values in one column without blanks. However, I cannot get the array to list values by specific year. I have tried the following formulas:

=LARGE(IF(YEAR(b7:b5000)=2015,C7:C5000,{1;2;3;4;5}))
=IF(YEAR(B7:B5000)=2015,LARGE(C7:C5000,{1;2;3;4;5}))
=LARGE(C7:C5000,IF(YEAR(B7:B5000)=2015,{1;2;3;4;5}))

There are actually many more data points for each year, but I wanted to keep the formulas short for this purposes.

What I get is a column of the top 5 largest values regardless of year. Sometimes I get a #NUM! error; sometimes I get a FALSE error;

The date in column B is in the format dd/mm/yyyy, formatted as a date (I think it is referred to as a Short Date); The values in column C are formatted as General; I have a cell that contains the year, formatted as General, but for this purpose I typed in the date. I select the formula and press CTRL+Shift+Enter. That generates the top values from column C correctly, but regardless of year. When I change 2015 with 2016 I get the same values, even though the data for 2016 is quite different.

Another issue: it appears that the results are dependent on how the dates are sorted on the Main page. If sorted newest to oldest (year 2016 is first) then I get the top values when I enter 2016 into the formula, but I get the #NUM! error for 2015. If I sort date oldest to newest, the exact reverse happens: 2016 now has the #NUM! error, but 2015 produces the top 5 largest values regardless of year.

I figure it has to do with the format or syntax of the YEAR function and where it is positioned in the formula, or these functions (I have tried SMALL and LARGE) cannot accommodate sorting by year.

This is very frustrating. Any suggestion?

Some forewarning: The spreadsheets are quite large, and as I said in the original post, there are more than 5 data points. The objective is to include all values for each year for the following reasons:
Determine and display the outliers on the top of the spreadsheet. Because of the number of data points, 2016 may not start until row 2000, and an outlier may appear in row 3500. The point of combining all the values in one contiguous column is so that a reviewer does not have to scroll through 3000 rows to see where the outlier is. If there were a way to search for the outlier and list the cell address of the value and the corresponding date right at the top. But here goes.
I had to delete several rows to shrink the size of the file to be below limits for uploading. I hope I did this right - first time.

I think I see how the formula works. You had the LARGE formula look for the largest value (associated with "1" in column P) then the second largest number (associated with "2" in column P) and so forth. Before I read all your instructions, I highlighted all the cells first, entered the formula, then pressed CTRL+SHIFT+ENTER and all cells had the value 100. I then read all the instructions to select the first cell in the column, enter the formula, hit C+S+E then copied the formula down it worked fine. I then tried it with changing the date reference from 2015 to 2016 and all values look legitimate and no errors.

Thanks.
Vince T.