Year	Percent
1990	54.445
1991	54.396
1992	54.374
1993	53.259
1994	52.094
1995	50.872
1996	49.673
1997	48.434
1998	47.135
1999	45.747
2000	44.256
2001	46.803
2002	46.393
2003	44.952
2004	45.788
2005	44.743
2006	46.89
2007	48.109
2008	48.842
2009	48.089
2010	47.698
2011	47.218
2012	47.823
2013	48.527
2014	48.629
2015	48.633
2016	47.763
2017	47.77
2018	47.76
2019	47.729
2020	47.674
2021	47.565
2022	47.438
2023	47.304
2024	47.185
2025	47.098
2026	47.021
2027	46.985
2028	46.98
2029	46.981
2030	46.973