Year	Percent
1990	78.552
1991	78.832
1992	79.037
1993	79.122
1994	79.07
1995	78.996
1996	78.867
1997	78.768
1998	78.988
1999	78.981
2000	78.883
2001	78.877
2002	78.812
2003	78.66
2004	78.407
2005	77.868
2006	77.708
2007	77.508
2008	77.97
2009	78.016
2010	77.692
2011	78.435
2012	77.98
2013	77.512
2014	78.098
2015	77.139
2016	76.91
2017	76.936
2018	76.97
2019	77.004
2020	77.035
2021	77.066
2022	77.096
2023	77.12
2024	77.135
2025	77.136
2026	77.128
2027	77.108
2028	77.081
2029	77.052
2030	77.025