Year	Percent
1950	4.68025
1955	4.38819
1960	4.06844
1965	3.83493
1970	3.95014
1975	4.01922
1980	4.25545
1985	4.41897
1990	4.7452
1995	5.31325
2000	6.10056
2005	6.29414
2010	6.01052
2015	5.96913
2020	7.10141
2025	8.85796
2030	11.03102
2035	13.53523
2040	16.50319
2045	21.77639
2050	28.38724
2055	33.33265
2060	35.60062
2065	36.38304
2070	37.08755
2075	38.35646
2080	39.35257
2085	39.67663
2090	39.4532
2095	39.22506
2100	39.41667