Year	Percent
1950	9.68602
1955	11.56589
1960	13.03165
1965	13.48038
1970	14.49118
1975	15.51753
1980	15.24833
1985	15.57802
1990	15.58624
1995	15.8143
2000	13.9035
2005	14.41966
2010	14.74621
2015	15.03118
2020	13.36053
2025	12.08111
2030	11.3178
2035	10.82742
2040	10.38379
2045	9.84442
2050	9.22806
2055	8.58878
2060	8.02648
2065	7.56737
2070	7.16733
2075	6.80367
2080	6.4438
2085	6.11114
2090	5.82485
2095	5.59301
2100	5.41912