Year Bachelor’s degree Postgraduate degree
1960 2.5% 2.6%
1970 4.0% 5.0%
1980 7.0% 8.7%
1990 11.5% 8.8%
2000 13.7% 10.3%
2010 15.9% 11.1%
2013 16.4% 11.9%
2014 16.6% 12.0%
2015 17.1% 12.6%
2016 17.2% 12.8%
2017 17.8% 13.4%
2018 18.1% 13.9%