Year	Percent
1950	4.84501
1955	4.64361
1960	4.57074
1965	4.53553
1970	4.55367
1975	4.57725
1980	4.56861
1985	4.50427
1990	4.63319
1995	4.42778
2000	4.23333
2005	4.04527
2010	3.90491
2015	4.23272
2020	4.48335
2025	4.72155
2030	4.95221
2035	5.26017
2040	5.66288
2045	6.09031
2050	6.59455
2055	7.14809
2060	7.78875
2065	8.61849
2070	9.63441
2075	10.6824
2080	11.74877
2085	12.85975
2090	14.02663
2095	15.23781
2100	16.47488