Year	Percent
1950	10.7515
1955	10.87135
1960	12.08734
1965	9.87842
1970	7.9631
1975	7.62679
1980	7.94155
1985	8.6381
1990	7.18393
1995	6.28643
2000	5.54511
2005	5.00143
2010	4.85574
2015	4.65568
2020	4.62704
2025	4.57814
2030	4.46872
2035	4.38813
2040	4.38016
2045	4.4303
2050	4.49784
2055	4.55368
2060	4.59138
2065	4.61525
2070	4.64182
2075	4.68811
2080	4.73328
2085	4.7615
2090	4.77438
2095	4.75931
2100	4.733