Year	% of cohort
1975	57.0148315429688
1976	73.4128112792969
1992	82.266487121582
1993	83.7839508056641
1994	86.0997619628906
1995	86.3451766967773
1996	86.1890411376953
1998	89.7832107543945
1999	89.9975967407227
2000	89.2668762207031
2001	91.2684326171875
2002	93.5630569458008
2003	93.5006103515625
2004	94.4015426635742
2005	95.2023391723633
2006	95.4746627807617
2007	94.7527923583984
2008	96.7407608032227
2009	96.7733383178711
2010	97.1086807250977
2011	97.3246307373047
2012	96.4663772583008
2013	97.2819290161133
2014	97.2213516235352
2015	94.8507919311523
2016	98.4244232177734
2017	96.3634796142578
2018	98.1313018798828
2019	97.7308502197266
2020	98.9646224975586
2021	98.2583312988281