Year	Percent
1950	5.47453
1955	4.97899
1960	4.64477
1965	4.37369
1970	4.20955
1975	4.0641
1980	3.75021
1985	3.42744
1990	3.31572
1995	4.48682
2000	4.13951
2005	4.01569
2010	4.1223
2015	4.21278
2020	4.36018
2025	4.48162
2030	4.65658
2035	5.13162
2040	6.1537
2045	7.47588
2050	9.14064
2055	10.96854
2060	12.37716
2065	13.67044
2070	15.11149
2075	16.79088
2080	18.48798
2085	20.09534
2090	21.58826
2095	22.99673
2100	24.32057