Year	Percent
1990	53.373
1991	53.997
1992	54.743
1993	54.036
1994	55.737
1995	54.612
1996	55.141
1997	57.052
1998	56.713
1999	56.69
2000	57.404
2001	60.296
2002	61.012
2003	62.365
2004	62.383
2005	61.735
2006	62.868
2007	64.13
2008	64.576
2009	65.339
2010	66.761
2011	66.124
2012	65.764
2013	66.309
2014	68.484
2015	68.815
2016	69.284
2017	69.552
2018	69.792
2019	70.019
2020	70.233
2021	70.49
2022	70.693
2023	70.869
2024	71.029
2025	71.178
2026	71.361
2027	71.519
2028	71.674
2029	71.847
2030	72.045