Year	Percent
1950	13.03781
1955	14.46644
1960	15.85661
1965	14.84618
1970	15.9164
1975	15.44514
1980	12.69917
1985	11.14924
1990	10.15257
1995	10.39309
2000	9.81601
2005	9.05999
2010	9.13581
2015	8.36106
2020	7.91293
2025	7.24056
2030	6.88635
2035	6.69663
2040	6.50476
2045	6.25237
2050	5.97262
2055	5.74152
2060	5.57108
2065	5.45296
2070	5.3351
2075	5.20165
2080	5.05479
2085	4.92476
2090	4.83682
2095	4.78763
2100	4.75855