Year	Percent
1950	11.25787
1955	9.70395
1960	9.17463
1965	9.22134
1970	10.49945
1975	10.33784
1980	10.29193
1985	10.18467
1990	10.40437
1995	10.41809
2000	10.07891
2005	9.3076
2010	8.6652
2015	8.5219
2020	8.12612
2025	7.62314
2030	7.30631
2035	6.91085
2040	6.47859
2045	6.10831
2050	5.8603
2055	5.6535
2060	5.49785
2065	5.3452
2070	5.19474
2075	5.06509
2080	4.98051
2085	4.92212
2090	4.89327
2095	4.85668
2100	4.81799