Year	Percent
1950	24.35006
1955	24.40286
1960	21.53183
1965	21.22946
1970	21.97468
1975	22.96188
1980	24.45702
1985	24.32063
1990	24.5558
1995	26.27649
2000	27.72765
2005	29.26597
2010	30.16936
2015	29.14568
2020	29.09688
2025	28.89659
2030	28.19609
2035	26.70821
2040	24.15779
2045	21.87079
2050	21.04585
2055	21.68231
2060	22.71996
2065	23.51438
2070	23.15421
2075	22.33646
2080	21.84939
2085	21.93752
2090	22.37762
2095	22.6964
2100	22.56993