Year	Percent
1990	45.845
1991	45.878
1992	45.882
1993	45.872
1994	46.159
1995	46.441
1996	46.678
1997	46.917
1998	47.166
1999	47.434
2000	47.726
2001	48.098
2002	48.473
2003	48.85
2004	49.229
2005	49.612
2006	50.008
2007	50.4
2008	50.782
2009	51.142
2010	51.477
2011	51.794
2012	52.082
2013	52.112
2014	52.121
2015	52.2
2016	52.244
2017	52.407
2018	52.573
2019	52.74
2020	52.906
2021	53.075
2022	53.241
2023	53.408
2024	53.578
2025	53.754
2026	53.935
2027	54.117
2028	54.304
2029	54.503
2030	54.718