Year	Percent
1950	29.7824
1955	27.85242
1960	27.1582
1965	26.0692
1970	26.80047
1975	27.41246
1980	28.65521
1985	30.49503
1990	30.62338
1995	30.34051
2000	29.15264
2005	27.97698
2010	27.12847
2015	26.84597
2020	26.26756
2025	25.13152
2030	24.45782
2035	24.18582
2040	24.3053
2045	24.60481
2050	24.22436
2055	23.65055
2060	23.2005
2065	22.97219
2070	22.95246
2075	22.95702
2080	22.8003
2085	22.47589
2090	22.12507
2095	21.86046
2100	21.7071