Year	Percent
1950	29.27128
1955	28.49751
1960	27.67833
1965	26.78062
1970	25.69621
1975	25.93188
1980	27.87457
1985	28.26189
1990	28.0145
1995	25.15478
2000	23.65077
2005	25.95841
2010	28.1003
2015	29.5442
2020	29.60564
2025	28.9623
2030	28.75668
2035	29.25337
2040	30.31088
2045	31.0346
2050	31.00283
2055	30.74431
2060	30.58854
2065	30.64931
2070	30.75262
2075	30.63065
2080	30.2265
2085	29.72253
2090	29.29441
2095	28.97373
2100	28.67069