Year	Percent
1990	47.754
1991	47.967
1992	48.167
1993	48.372
1994	48.369
1995	48.33
1996	48.341
1997	47.792
1998	47.254
1999	46.737
2000	47.218
2001	47.725
2002	48.234
2003	49.262
2004	46.754
2005	49.089
2006	49.143
2007	50.35
2008	50.088
2009	49.938
2010	50.371
2011	51.246
2012	50.797
2013	52.582
2014	52.333
2015	51.831
2016	50.67
2017	51.083
2018	51.494
2019	51.89
2020	52.261
2021	52.621
2022	52.954
2023	53.259
2024	53.536
2025	53.786
2026	54.02
2027	54.226
2028	54.411
2029	54.59
2030	54.773