Year	Percent
1950	11.68947
1955	12.24718
1960	12.29924
1965	12.29058
1970	12.78209
1975	12.2317
1980	10.76225
1985	10.06095
1990	10.98717
1995	10.45215
2000	10.89958
2005	10.60414
2010	6.92342
2015	4.55207
2020	4.59926
2025	5.40231
2030	5.30979
2035	4.90053
2040	4.32758
2045	3.98617
2050	3.9171
2055	4.01148
2060	4.05437
2065	3.95784
2070	3.7871
2075	3.66891
2080	3.68422
2085	3.8079
2090	3.9511
2095	4.02805
2100	4.03177