Year	Percent
1950	20.06453
1955	19.997
1960	20.11848
1965	20.70035
1970	20.99547
1975	20.6584
1980	20.37303
1985	20.55094
1990	22.08814
1995	24.53945
2000	27.58769
2005	29.85123
2010	29.41489
2015	28.04429
2020	26.47748
2025	25.30936
2030	25.21712
2035	25.64811
2040	25.3848
2045	24.46014
2050	24.03967
2055	23.47825
2060	23.48697
2065	23.74593
2070	23.54621
2075	23.21309
2080	22.87858
2085	22.65022
2090	22.53295
2095	22.48919
2100	22.39247