Forecast

Hi, I have the following years and dates where my company's sales were 100%. I want to forecast the date/ month/ year when my sales will be 100%. Can someone help me what formula to use to forecast please. I want to forecast for years between 2018-2021. Thank you

10-Jul-73
17-May-95
14-Feb-01
3-Mar-06
30-Aug-06
8-Jun-08
22-Sep-08
2-Jul-08
30-Apr-09
15-May-11
29-Aug-11
22-May-13
28-Oct-13
22-May-14
4-Aug-14
20-Oct-14
5-Nov-14
10-Nov-14
21-Dec-14
22-Dec-14
20-Jun-15
14-Jul-16
28-Nov-16
19-Dec-16
8-Jan-17
20-Jan-17
22-Mar-17
7-Apr-17
18-May-17
3-Jun-17
6-Jun-17
19-Jun-17
19-Jun-17
29-Jul-17
9-Aug-17
12-Aug-17
17-Aug-17
17-Aug-17
21-Aug-17
30-Sep-17
31-Oct-17

Of sales i.e., sales were 100%, sold out..

Thank you all, now i got it, that i cant predict it this way.

Thakn you i understood you want both dependant and independant variables. I thought one was suffiecient for this case.. I know trend and forecast function when two variables are available.