Retirement tax questions

Hi, I'm sorry but I found I have another question related to this. I've had my Roth open since at least 2002. Since I had to take that $2k out last year, it appears TT is asking me to enter my prior year Roth IRA contributions. If I leave this blank, is there a problem? The error checker didn't point anything out, I've left it blank until today (and I've been running my taxes the last 2 days).

 

Do I really have to go back 20 years to find/enter all my contributions? Thank you in advance.