Year	Percent
1950	16.17362
1955	16.89267
1960	16.7167
1965	17.02222
1970	16.98691
1975	15.92076
1980	14.90075
1985	13.23641
1990	12.96777
1995	11.4602
2000	10.63134
2005	9.64559
2010	8.57247
2015	8.30661
2020	7.58598
2025	7.08508
2030	6.5786
2035	6.16028
2040	5.84223
2045	5.62704
2050	5.44851
2055	5.26856
2060	5.09917
2065	4.93501
2070	4.82275
2075	4.744
2080	4.69023
2085	4.6309
2090	4.56684
2095	4.51097
2100	4.46948