Year	Percent
1950	15.61207
1955	15.59531
1960	14.61256
1965	13.7398
1970	13.01603
1975	12.70052
1980	12.17026
1985	11.72036
1990	11.4564
1995	12.52815
2000	14.25434
2005	16.60928
2010	18.60278
2015	19.80114
2020	21.70122
2025	23.92877
2030	25.81462
2035	26.56297
2040	25.17031
2045	22.86008
2050	22.0904
2055	23.1952
2060	24.94728
2065	26.36025
2070	25.9324
2075	24.15541
2080	23.0103
2085	22.74845
2090	23.13402
2095	23.52451
2100	23.45267