Year	% of cohort
1971	40.6664581298828
1972	42.6864814758301
1973	43.7768898010254
1974	45.3942718505859
1975	46.6257019042969
1976	46.9172897338867
1977	48.4288787841797
1978	47.6832313537598
1979	48.0368499755859
1980	46.9065399169922
1981	46.8948287963867
1982	49.4043197631836
1983	49.4081611633301
1984	50.3112297058105
1985	52.4897689819336
1986	53.6430511474609
1987	54.1484413146973
1988	54.8349800109863
1989	55.0753517150879
1990	56.1695289611816
1991	55.7285690307617
1992	56.8326301574707
1993	56.2718200683594
1994	55.5465812683105
1995	56.2844696044922
1996	55.5437202453613
1997	55.8543891906738
1998	56.1752815246582
1999	57.5322418212891
2000	59.5038414001465
2001	61.8022308349609
2002	60.9195709228516
2003	59.8682594299316
2004	61.1091613769531
2005	61.3217582702637
2006	61.3420791625977
2007	60.9225692749023
2008	59.6122398376465
2009	58.7507019042969
2010	57.9359512329102
2011	59.6586799621582
2012	57.1703109741211
2013	57.9180297851562
2014	59.162410736084
2015	60.6884689331055
2016	60.6055908203125
2017	61.6509895324707
2018	62.1122703552246
2019	62.5945091247559
2020	63.450439453125