You simply subtract the numbers. 2017 - 1993 ... use your calculator if you can't do it longhand.
Since 1993
Since 1993
Since 1993
He's been an MP since 1993 and Prime Minister since 2006.
Since 1993 to Francis Cain.
she has been actin since 1992 or 1993
Since 1993.
Officialy since 1993.
Since around 1993
Since 1993(19 years)
15 years, since 1993.
Eric Carmen has been married to Susan since 1993.