Year	Percent
1950	8.55773
1955	9.13866
1960	8.24014
1965	8.67209
1970	8.14342
1975	8.02813
1980	7.34499
1985	7.29164
1990	6.49958
1995	5.19348
2000	4.85834
2005	4.84357
2010	4.65959
2015	4.92897
2020	4.33711
2025	3.86014
2030	3.60115
2035	3.61758
2040	3.74477
2045	3.8934
2050	3.94117
2055	3.86218
2060	3.77307
2065	3.78935
2070	3.92409
2075	4.10105
2080	4.22955
2085	4.26221
2090	4.22262
2095	4.1876
2100	4.20619