According to the item the proportion of marriages ending in divorce has increased from 27,000 to almost 55,000 between 1961 and 1969. Although the changes in law might have an impact on the divorce rate of couples, I think that other factors are just as important or maybe even more important than changes to the law.
The divorce reform act was introduced in 1969 and so couples were able to get a divorce without needing to prove adultery, cruelty or desertion. But to decrease the divorce rates, the government only accepted divorce requests from partners that have been living separate