Year	Percent
1950	14.6775
1955	14.45334
1960	14.71422
1965	15.3545
1970	15.76575
1975	15.8539
1980	14.11762
1985	15.00337
1990	19.11657
1995	20.15915
2000	20.60516
2005	20.8688
2010	23.08865
2015	25.03625
2020	26.72848
2025	28.45908
2030	29.97445
2035	31.21056
2040	31.61681
2045	31.99757
2050	32.15672
2055	32.13724
2060	32.307
2065	32.69325
2070	33.22309
2075	33.70555
2080	34.15163
2085	34.58705
2090	35.06143
2095	35.59063
2100	36.1037