Year	Percent
1990	69.339
1991	69.989
1992	71.059
1993	72.234
1994	73.711
1995	74.225
1996	74.017
1997	73.629
1998	73.613
1999	73.502
2000	73.288
2001	73.069
2002	73.128
2003	73.274
2004	73.387
2005	73.997
2006	74.58
2007	73.042
2008	71.431
2009	69.736
2010	70.173
2011	70.024
2012	69.401
2013	64.437
2014	66.331
2015	65.121
2016	63.674
2017	63.438
2018	63.24
2019	63.078
2020	62.949
2021	62.853
2022	62.791
2023	62.758
2024	62.742
2025	62.734
2026	62.73
2027	62.731
2028	62.724
2029	62.69
2030	62.614