Year	Percent
1950	4.89827
1955	4.75964
1960	4.56196
1965	4.38131
1970	4.19177
1975	4.05493
1980	3.8928
1985	3.65275
1990	3.62279
1995	3.74042
2000	3.65067
2005	3.62176
2010	3.86466
2015	4.01362
2020	4.2767
2025	4.61884
2030	5.07469
2035	5.69501
2040	6.56294
2045	7.63199
2050	8.82634
2055	10.33452
2060	12.33347
2065	14.65885
2070	17.1033
2075	19.14926
2080	21.09049
2085	22.85463
2090	24.49135
2095	26.02361
2100	27.44704