Year	Percent
1990	47.363
1991	48.207
1992	46.968
1993	46.328
1994	46.702
1995	47.365
1996	47.523
1997	47.725
1998	48.298
1999	48.933
2000	49.587
2001	50.301
2002	51.587
2003	51.357
2004	51.578
2005	51.739
2006	52.029
2007	52.5
2008	52.488
2009	52.637
2010	51.393
2011	52.383
2012	53.213
2013	54.051
2014	54.211
2015	54.468
2016	54.213
2017	54.025
2018	53.824
2019	53.582
2020	53.278
2021	52.824
2022	52.308
2023	51.75
2024	51.181
2025	50.621
2026	50.056
2027	49.505
2028	48.965
2029	48.427
2030	47.885