Year	Percent
1950	12.75683
1955	13.03115
1960	13.53501
1965	13.78244
1970	14.53082
1975	15.31751
1980	15.61788
1985	15.91656
1990	19.4537
1995	19.49756
2000	20.15254
2005	21.27523
2010	22.82636
2015	23.50318
2020	25.31934
2025	28.02013
2030	30.63389
2035	32.04594
2040	32.95374
2045	34.18116
2050	35.02202
2055	35.44992
2060	35.40932
2065	35.2322
2070	35.243
2075	35.551
2080	36.07325
2085	36.58397
2090	37.06547
2095	37.52366
2100	38.01398