Year	Percent
1990	41.444
1991	41.453
1992	41.445
1993	41.47
1994	41.5
1995	42.272
1996	43.047
1997	43.826
1998	44.608
1999	45.392
2000	46.179
2001	46.968
2002	47.759
2003	48.55
2004	49.342
2005	50.135
2006	50.927
2007	51.719
2008	52.51
2009	53.3
2010	46.91
2011	47.03
2012	51.38
2013	48.81
2014	48.25
2015	44.82
2016	48.15
2017	48.216
2018	48.281
2019	48.347
2020	48.413
2021	48.479
2022	48.544
2023	48.61
2024	48.676
2025	48.741
2026	48.807
2027	48.873
2028	48.939
2029	49.004
2030	49.07