Year	Percent
1990	37.188
1991	37.214
1992	37.139
1993	37.117
1994	37.113
1995	37.106
1996	37.138
1997	37.177
1998	37.246
1999	37.302
2000	37.307
2001	37.411
2002	37.43
2003	37.489
2004	37.499
2005	39.688
2006	41.953
2007	44.271
2008	46.627
2009	49.004
2010	51.387
2011	54.228
2012	57.008
2013	59.684
2014	62.223
2015	62.243
2016	62.295
2017	62.618
2018	62.934
2019	63.243
2020	63.549
2021	63.865
2022	64.179
2023	64.494
2024	64.816
2025	65.149
2026	65.502
2027	65.862
2028	66.229
2029	66.599
2030	66.972