Membership of the Senate was increased from 87 to 100 in the year ____

Senate was established according to Article 59 of Constitution of Pakistan.
Senate Membership in 1973 was 45.
Senate Membership in 1978 was 63.
Senate Membership in 1985 was 87.
Senate Membership in 2002 was 100.
Senate Membership in 2011 was 104.
Senate Membership in 2021 was 100.