Year	Percent
1990	80.791
1991	80.988
1992	81.127
1993	81.392
1994	81.737
1995	81.948
1996	80.486
1997	78.978
1998	77.971
1999	77.513
2000	76.991
2001	76.807
2002	77.022
2003	77.35
2004	77.407
2005	77.418
2006	77.025
2007	77.345
2008	78.035
2009	79.336
2010	80.942
2011	82.371
2012	83.459
2013	84.882
2014	86.302
2015	87.368
2016	87.212
2017	87.307
2018	87.706
2019	88.295
2020	88.913
2021	88.353
2022	87.733
2023	87.149
2024	86.688
2025	86.358
2026	85.629
2027	84.962
2028	84.407
2029	83.977
2030	83.643