Year	Percent
1950	15.43223
1955	15.27343
1960	15.32259
1965	14.69827
1970	14.43711
1975	14.6338
1980	14.63019
1985	14.60583
1990	14.36249
1995	15.41781
2000	17.44223
2005	20.51755
2010	23.31104
2015	24.05823
2020	24.74004
2025	25.80072
2030	26.91727
2035	27.51179
2040	26.67591
2045	24.84778
2050	23.3724
2055	23.83871
2060	24.95634
2065	25.92976
2070	25.95139
2075	24.55028
2080	23.40353
2085	22.9956
2090	23.23672
2095	23.61592
2100	23.61774