Year	Percent
1990	71.751
1991	70.956
1992	71.815
1993	72.945
1994	73.921
1995	75.139
1996	76.129
1997	75.203
1998	75.145
1999	75.076
2000	75.021
2001	75.048
2002	75.098
2003	75.153
2004	75.778
2005	75.76
2006	75.696
2007	75.589
2008	75.457
2009	75.328
2010	75.227
2011	75.346
2012	73.869
2013	75.28
2014	74.519
2015	74.44
2016	75.212
2017	75.161
2018	75.103
2019	75.06
2020	75.041
2021	75.041
2022	75.066
2023	75.109
2024	75.161
2025	75.217
2026	75.281
2027	75.359
2028	75.446
2029	75.529
2030	75.597