Year	Percent
1990	78.003
1991	77.984
1992	77.981
1993	78.001
1994	78.043
1995	78.133
1996	77.994
1997	77.931
1998	77.95
1999	78.065
2000	78.234
2001	78.271
2002	78.391
2003	78.585
2004	78.812
2005	79.047
2006	79.077
2007	79.123
2008	79.211
2009	79.351
2010	79.5
2011	79.521
2012	79.569
2013	79.636
2014	79.706
2015	79.762
2016	79.704
2017	79.629
2018	79.55
2019	79.477
2020	79.411
2021	79.245
2022	79.093
2023	78.95
2024	78.804
2025	78.64
2026	78.379
2027	78.113
2028	77.856
2029	77.629
2030	77.434