Year	Percent
1950	5.78821
1955	5.12039
1960	4.83833
1965	4.76142
1970	4.61853
1975	4.5177
1980	4.51996
1985	4.54379
1990	4.71185
1995	4.53246
2000	4.37668
2005	4.38865
2010	4.43814
2015	4.47989
2020	4.69834
2025	5.1134
2030	5.63501
2035	6.32097
2040	7.16946
2045	8.14434
2050	9.52303
2055	11.22764
2060	12.77035
2065	14.0464
2070	15.3167
2075	16.97536
2080	18.59697
2085	20.12554
2090	21.53371
2095	22.84196
2100	24.09025