Year	Percent
1990	81.339
1991	81.506
1992	81.599
1993	81.686
1994	81.851
1995	81.934
1996	81.95
1997	81.934
1998	83.89
1999	83.52
2000	83.133
2001	82.735
2002	82.312
2003	82.736
2004	83.005
2005	83.194
2006	84.602
2007	83.933
2008	83.195
2009	82.391
2010	80.494
2011	79.842
2012	79.851
2013	79.49
2014	80.037
2015	81.185
2016	81.457
2017	81.323
2018	81.179
2019	81.019
2020	80.836
2021	80.649
2022	80.444
2023	80.223
2024	79.994
2025	79.759
2026	79.535
2027	79.308
2028	79.076
2029	78.841
2030	78.602