Year	Percent
1950	28.93067
1955	28.05805
1960	27.69498
1965	27.07414
1970	27.02475
1975	27.25427
1980	27.72928
1985	28.08489
1990	27.98395
1995	27.61601
2000	26.39741
2005	25.49774
2010	25.47429
2015	26.23088
2020	27.19429
2025	27.94941
2030	28.63714
2035	29.20867
2040	29.75453
2045	30.37186
2050	30.84556
2055	31.20197
2060	31.32579
2065	31.35165
2070	31.32377
2075	31.23354
2080	31.07593
2085	30.83213
2090	30.51893
2095	30.17646
2100	29.82128