Year	Percent
1950	15.4359
1955	17.89469
1960	17.27096
1965	16.40776
1970	15.66367
1975	15.29799
1980	14.57265
1985	13.39712
1990	11.88116
1995	10.68182
2000	10.15908
2005	9.2743
2010	8.54255
2015	8.27615
2020	7.34608
2025	6.85456
2030	6.398
2035	6.03277
2040	5.71873
2045	5.46859
2050	5.23466
2055	5.01638
2060	4.83266
2065	4.70501
2070	4.61297
2075	4.55502
2080	4.49518
2085	4.43777
2090	4.38416
2095	4.34857
2100	4.33425