Year	Percent
1950	17.19875
1955	18.18489
1960	16.6581
1965	15.52287
1970	15.22212
1975	14.9415
1980	13.83639
1985	13.53788
1990	13.8456
1995	14.79555
2000	16.38378
2005	19.75002
2010	21.16017
2015	22.13699
2020	23.00276
2025	24.14357
2030	25.48091
2035	26.92466
2040	27.95518
2045	27.22292
2050	25.79839
2055	23.52934
2060	22.57872
2065	22.69209
2070	22.86258
2075	23.22404
2080	21.94278
2085	20.87206
2090	20.34605
2095	20.35154
2100	20.56621