Year	% of cohort
1972	2.77601003646851
1973	37.4783706665039
1974	57.7585296630859
1975	45.2602691650391
1976	47.0644111633301
1977	77.6587600708008
1978	47.9391403198242
1979	71.279670715332
1980	77.2494583129883
1987	82.7902908325195
1988	64.9314575195312
1989	70.8508071899414
1991	65.2630996704102
2000	53.9803085327148
2001	60.4026489257812
2002	63.071159362793
2003	58.0185890197754
2004	60.7194404602051
2006	61.472339630127
2007	55.9484100341797
2009	51.8393402099609
2010	47.2584114074707
2011	40.5271492004395
2012	47.0520896911621
2013	46.526798248291
2014	40.8645782470703
2015	41.0066986083984
2016	40.4508018493652
2017	40.2373008728027
2018	38.5476684570312
2019	45.7311592102051