Year	Percent
1990	72.788
1991	72.711
1992	72.617
1993	72.501
1994	72.436
1995	72.387
1996	72.35
1997	72.277
1998	72.22
1999	72.147
2000	72.063
2001	72.023
2002	72.008
2003	72.007
2004	72.012
2005	72.014
2006	72.028
2007	72.04
2008	72.05
2009	72.045
2010	72.066
2011	72.101
2012	72.135
2013	72.171
2014	72.199
2015	72.202
2016	72.179
2017	72.172
2018	72.162
2019	72.15
2020	72.137
2021	72.121
2022	72.107
2023	72.096
2024	72.091
2025	72.095
2026	72.104
2027	72.12
2028	72.147
2029	72.188
2030	72.243