Year	Percent
1950	23.90496
1955	24.57321
1960	22.96825
1965	23.80654
1970	24.40066
1975	25.75046
1980	27.65587
1985	25.71725
1990	25.27403
1995	25.94402
2000	25.98476
2005	28.10272
2010	27.67041
2015	27.10637
2020	26.86383
2025	26.72923
2030	27.00999
2035	26.25762
2040	25.52214
2045	24.07598
2050	23.48727
2055	23.52947
2060	23.10007
2065	23.18673
2070	22.51844
2075	21.96162
2080	21.78986
2085	21.90836
2090	22.05975
2095	22.08819
2100	21.93423