Year	Percent
1950	36.38305
1955	38.75517
1960	42.5528
1965	39.73718
1970	34.6416
1975	32.0651
1980	35.11526
1985	37.75988
1990	39.34912
1995	43.43921
2000	40.13832
2005	44.10374
2010	45.51742
2015	40.58193
2020	36.85889
2025	34.1045
2030	33.38555
2035	33.00854
2040	32.1347
2045	31.55034
2050	30.65068
2055	29.64747
2060	28.74158
2065	28.35097
2070	28.12206
2075	27.73195
2080	27.12555
2085	26.40826
2090	25.75818
2095	25.29254
2100	24.97481