Year	Percent
1950	18.11247
1955	16.47935
1960	14.49925
1965	13.16426
1970	12.27813
1975	12.33388
1980	12.41675
1985	12.10721
1990	11.7325
1995	11.89512
2000	12.12275
2005	12.63576
2010	13.27071
2015	13.79925
2020	14.3649
2025	14.89749
2030	15.54281
2035	16.45235
2040	17.61899
2045	18.70915
2050	19.59388
2055	20.16974
2060	20.6372
2065	21.18299
2070	21.75657
2075	22.2955
2080	22.67128
2085	22.94841
2090	23.19756
2095	23.45326
2100	23.68556