Year	Percent
1990	42.531
1991	43.378
1992	43.453
1993	45.265
1994	46.599
1995	47.095
1996	48.778
1997	49.796
1998	52.195
1999	54.402
2000	55.569
2001	55.932
2002	57.2
2003	57.675
2004	58.159
2005	60.885
2006	61.805
2007	63.195
2008	63.161
2009	62.583
2010	62.081
2011	61.994
2012	62.053
2013	62.799
2014	62.67
2015	62.832
2016	63.835
2017	63.79
2018	63.732
2019	63.658
2020	63.569
2021	63.458
2022	63.339
2023	63.233
2024	63.171
2025	63.171
2026	63.211
2027	63.317
2028	63.475
2029	63.66
2030	63.853