As salamo alaikum wr wb.The denmohar was given after 18 years of marriage.during marriage it was 2000,so tell that after 18 years will it be 2000 or change according to time.
بسم الله الرحمن الرحيم
(Fatwa: 55/41/L=1432)
In the question mentioned above, the mahr shall be 2000. It will not undergo any change with the passage of time.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband