Year	Percent
1950	27.50342
1955	27.42969
1960	27.21379
1965	27.47956
1970	28.08409
1975	29.34312
1980	32.706
1985	36.40302
1990	38.1184
1995	34.95157
2000	35.94566
2005	37.916
2010	38.34106
2015	37.62246
2020	34.87516
2025	32.20278
2030	30.7953
2035	29.68053
2040	29.43727
2045	28.91705
2050	27.85003
2055	26.50986
2060	25.05263
2065	24.16587
2070	23.8747
2075	23.85959
2080	23.74653
2085	23.32776
2090	22.69645
2095	22.13212
2100	21.83241