Year	Percent
1950	5.74275
1955	5.24501
1960	5.11086
1965	5.27218
1970	6.37084
1975	7.15826
1980	7.58615
1985	7.70694
1990	9.15397
1995	9.69047
2000	10.67167
2005	12.02351
2010	13.58616
2015	15.43646
2020	17.83411
2025	20.70346
2030	22.33828
2035	23.99058
2040	25.93939
2045	29.22867
2050	31.55987
2055	32.36185
2060	32.31322
2065	32.57502
2070	33.33692
2075	34.18298
2080	34.6061
2085	34.68552
2090	34.65685
2095	34.72775
2100	34.96537