Year	Percent
1950	11.75353
1955	12.35793
1960	11.02273
1965	8.16029
1970	7.93224
1975	10.04036
1980	10.84636
1985	10.60605
1990	10.24035
1995	10.37854
2000	12.72897
2005	13.23094
2010	11.11078
2015	7.46864
2020	6.01688
2025	6.35906
2030	7.25038
2035	6.93244
2040	5.97721
2045	4.99113
2050	4.50962
2055	4.57157
2060	4.81318
2065	4.84083
2070	4.59255
2075	4.2986
2080	4.18195
2085	4.30256
2090	4.50743
2095	4.61173
2100	4.54669