Year	Percent
1950	20.35434
1955	20.09711
1960	19.88165
1965	19.57543
1970	18.34454
1975	16.73448
1980	14.69181
1985	13.28618
1990	12.4357
1995	11.23268
2000	10.14199
2005	8.85842
2010	8.47093
2015	7.7758
2020	7.22483
2025	6.67306
2030	6.21733
2035	5.86888
2040	5.61368
2045	5.40102
2050	5.19624
2055	5.00653
2060	4.82783
2065	4.70118
2070	4.60777
2075	4.5392
2080	4.47099
2085	4.40032
2090	4.33933
2095	4.29687
2100	4.27285