Year	%
1990	47.6223776223776
1991	47.9299363057325
1992	48.1632653061224
1993	48.3767104910115
1994	48.5367063492063
1995	48.6966551326413
1996	48.7946620749031
1997	48.8615756598831
1998	48.9212717638153
1999	48.9574050971306
2000	48.9734096263884
2001	48.9880478087649
2002	48.9792832300015
2003	48.9514507325481
2004	48.920174958994
2005	48.8790406673618
2006	48.8418430884184
2007	48.7964728312679
2008	48.7609912070344
2009	48.7182296231376
2010	48.6981371718882
2011	48.6538461538462
2012	48.6187845303867
2013	48.5882572924458
2014	48.5501391507317
2015	48.5107485107485
2016	47.7767878836964
2017	46.7092892064686
2018	45.490306265805
2019	44.4664946748694
2020	43.7095659820363
2021	43.1710392027376
2022	42.8159261396422