Year	Percent
1990	79.314
1991	79.435
1992	79.722
1993	79.104
1994	78.305
1995	77.351
1996	75.841
1997	74.613
1998	73.715
1999	73.206
2000	75.604
2001	74.872
2002	74.403
2003	74.171
2004	74.047
2005	73.971
2006	73.495
2007	73.686
2008	73.631
2009	73.596
2010	74.397
2011	75.327
2012	76.946
2013	78.416
2014	78.846
2015	79.154
2016	79.322
2017	79.486
2018	79.714
2019	79.97
2020	80.207
2021	79.687
2022	79.159
2023	78.646
2024	78.168
2025	77.723
2026	77.042
2027	76.407
2028	75.826
2029	75.293
2030	74.795