Year	Percent
1990	44.972
1991	45.029
1992	45.074
1993	45.08
1994	45.143
1995	45.177
1996	45.2
1997	45.563
1998	45.926
1999	46.29
2000	46
2001	52.1
2002	52.942
2003	53.782
2004	54.62
2005	58.226
2006	61.746
2007	65.147
2008	68.4
2009	68.418
2010	68.361
2011	68.281
2012	68.189
2013	68.082
2014	67.972
2015	67.852
2016	67.72
2017	68.081
2018	68.441
2019	68.802
2020	69.163
2021	69.523
2022	69.884
2023	70.244
2024	70.605
2025	70.966
2026	71.326
2027	71.687
2028	72.048
2029	72.408
2030	72.769