Year	%
1990	43.3766233766234
1991	42.9304029304029
1992	41.7121176191605
1993	41.0266574175007
1994	40.9896023825696
1995	41.1470674153656
1996	41.5257542732592
1997	42.2523514650395
1998	43.4496840348158
1999	44.5913965407657
2000	45.8041283518745
2001	46.9416050114068
2002	47.9908612746513
2003	48.9434796337228
2004	49.7855830100061
2005	50.4764979338843
2006	51.0082588646015
2007	51.4301020474828
2008	51.7534106813514
2009	51.9898579326389
2010	52.1604132964567
2011	52.2825577153577
2012	52.3436990677358
2013	52.3460506511354
2014	52.2827203075222
2015	52.1523047154558
2016	51.9464590443686
2017	51.7026950962917
2018	51.4307259335066
2019	51.0693489333531
2020	50.6143104568088
2021	50.0901878348139
2022	49.5327737484041