Year	Percent
1990	38.275
1991	38.529
1992	38.71
1993	38.82
1994	38.924
1995	39.085
1996	39.355
1997	39.643
1998	39.967
1999	40.319
2000	40.678
2001	41.013
2002	40.642
2003	40.203
2004	39.691
2005	41.135
2006	41.333
2007	40.475
2008	41.241
2009	41.511
2010	42.838
2011	42.459
2012	42.946
2013	44.028
2014	45.111
2015	46.162
2016	45.192
2017	45.131
2018	45.06
2019	45
2020	44.962
2021	44.96
2022	44.976
2023	44.999
2024	45.015
2025	45.016
2026	45.026
2027	45.025
2028	45.009
2029	44.979
2030	44.934