Year	Percent
1950	17.20658
1955	19.02965
1960	18.83877
1965	18.4122
1970	18.25851
1975	18.57171
1980	16.29168
1985	14.47082
1990	13.49683
1995	12.58773
2000	11.82158
2005	10.8251
2010	9.75382
2015	9.16116
2020	8.41065
2025	7.68548
2030	7.028
2035	6.49219
2040	6.06666
2045	5.73809
2050	5.46031
2055	5.22422
2060	5.00712
2065	4.84527
2070	4.71974
2075	4.63376
2080	4.57134
2085	4.51968
2090	4.48205
2095	4.45226
2100	4.43432