Year	Percent
1990	68.976
1991	69.885
1992	70.091
1993	69.851
1994	70.817
1995	71.546
1996	72.928
1997	72.286
1998	72.212
1999	73.171
2000	73.436
2001	74.167
2002	74.616
2003	74.548
2004	74.822
2005	75.946
2006	76.237
2007	76.439
2008	77.187
2009	77.26
2010	76.383
2011	77.366
2012	77.225
2013	78.04
2014	78.959
2015	78.853
2016	80.528
2017	80.626
2018	80.719
2019	80.814
2020	80.916
2021	81.026
2022	81.144
2023	81.271
2024	81.402
2025	81.536
2026	81.669
2027	81.799
2028	81.928
2029	82.059
2030	82.196