Year	Percent
1990	41.787
1991	41.705
1992	43.902
1993	45.465
1994	45.46
1995	44.186
1996	45.419
1997	46.6
1998	48.127
1999	48.851
2000	47.946
2001	48.112
2002	48.474
2003	49.91
2004	53.226
2005	52.341
2006	54.049
2007	56.301
2008	59.098
2009	59.739
2010	63.749
2011	65.978
2012	66.185
2013	66.929
2014	67.762
2015	68.047
2016	68.706
2017	69.002
2018	69.303
2019	69.607
2020	69.915
2021	70.226
2022	70.538
2023	70.85
2024	71.158
2025	71.462
2026	71.761
2027	72.056
2028	72.347
2029	72.635
2030	72.92