Year	Percent
1990	48.373
1991	55.229
1992	54.945
1993	54.688
1994	55.709
1995	56.671
1996	59.122
1997	59.841
1998	60.531
1999	61.213
2000	60.216
2001	61.347
2002	62.459
2003	64.884
2004	67.221
2005	69.486
2006	69.351
2007	68.048
2008	69.349
2009	68.267
2010	69.409
2011	69.835
2012	70.211
2013	70.55
2014	71.912
2015	70.237
2016	69.942
2017	70.392
2018	70.843
2019	71.274
2020	71.669
2021	72.037
2022	72.37
2023	72.679
2024	72.977
2025	73.273
2026	73.567
2027	73.856
2028	74.138
2029	74.415
2030	74.688