Year	Percent
1950	12.42686
1955	14.50807
1960	15.30665
1965	16.22982
1970	15.12258
1975	14.70352
1980	15.12162
1985	15.98135
1990	16.39062
1995	15.38688
2000	13.383
2005	13.55402
2010	13.54155
2015	13.6184
2020	12.82513
2025	11.84101
2030	10.89412
2035	10.29132
2040	9.88923
2045	9.44366
2050	8.84534
2055	8.18262
2060	7.59655
2065	7.14316
2070	6.77026
2075	6.44175
2080	6.10682
2085	5.79356
2090	5.53227
2095	5.33918
2100	5.19602