Year	Percent
1950	15.70962
1955	16.66167
1960	14.91562
1965	14.64092
1970	14.26114
1975	13.60585
1980	12.83987
1985	13.10328
1990	13.73059
1995	14.15159
2000	15.8617
2005	19.02985
2010	23.37126
2015	25.98153
2020	27.2906
2025	28.13232
2030	28.38117
2035	29.58101
2040	30.52952
2045	29.81248
2050	28.32091
2055	25.8881
2060	23.78024
2065	22.79324
2070	22.74328
2075	22.52478
2080	22.11849
2085	21.72651
2090	21.46538
2095	21.43695
2100	21.56478