Year	Percent
1950	9.91188
1955	8.82579
1960	8.72458
1965	9.32757
1970	8.89609
1975	8.16646
1980	6.68856
1985	5.63152
1990	5.22698
1995	5.0546
2000	4.88131
2005	4.95682
2010	4.96754
2015	4.5421
2020	4.3258
2025	4.23001
2030	4.26733
2035	4.36792
2040	4.45401
2045	4.47462
2050	4.44875
2055	4.44591
2060	4.50741
2065	4.61129
2070	4.70331
2075	4.74765
2080	4.73759
2085	4.69516
2090	4.66338
2095	4.65255
2100	4.6593