Year	Percent
1990	70.788
1991	71.123
1992	71.527
1993	71.998
1994	72.531
1995	72.392
1996	71.957
1997	71.632
1998	71.617
1999	71.613
2000	67.429
2001	71.367
2002	68.902
2003	69.998
2004	70.587
2005	69.809
2006	69.784
2007	69.757
2008	69.728
2009	69.688
2010	72.081
2011	72.19
2012	72.738
2013	71.242
2014	71.544
2015	72.053
2016	70.207
2017	70.333
2018	70.479
2019	70.661
2020	70.886
2021	71.147
2022	71.451
2023	71.789
2024	72.143
2025	72.503
2026	72.861
2027	73.228
2028	73.591
2029	73.923
2030	74.207