You're thinking of civil annulments, not Church.
Actually, pre-Vatican II valid grounds for annulments were minimal. It is only since Vatican II and the resultant 1983 New Code of Canon Law where there is much more leeway. There were 338 annulments granted in 1968 and 59,030 in 1992.
http://www.traditioninaction.org/religious/k012rpAnnulments_Stretenovic.html
Actually, pre-Vatican II valid grounds for annulments were minimal. It is only since Vatican II and the resultant 1983 New Code of Canon Law where there is much more leeway. There were 338 annulments granted in 1968 and 59,030 in 1992.
http://www.traditioninaction.org/religious/k012rpAnnulments_Stretenovic.html