Year	Percent
1990	43.244
1991	43.236
1992	43.087
1993	43.058
1994	43.097
1995	43.173
1996	43.134
1997	43.181
1998	43.325
1999	43.45
2000	43.473
2001	43.531
2002	43.45
2003	43.447
2004	43.37
2005	45.263
2006	47.175
2007	49.094
2008	51.008
2009	52.911
2010	54.796
2011	58.653
2012	62.414
2013	66.023
2014	69.433
2015	69.543
2016	69.764
2017	70.067
2018	70.368
2019	70.666
2020	70.964
2021	71.263
2022	71.562
2023	71.861
2024	72.16
2025	72.457
2026	72.755
2027	73.053
2028	73.351
2029	73.649
2030	73.949