Year	Percent
1950	28.15418
1955	28.96644
1960	29.75898
1965	30.74326
1970	30.04452
1975	30.04119
1980	31.20566
1985	34.76519
1990	36.33968
1995	40.44318
2000	38.73272
2005	40.75228
2010	43.7589
2015	40.95771
2020	36.06046
2025	31.54786
2030	30.17567
2035	30.161
2040	29.61913
2045	29.18891
2050	28.23469
2055	27.1304
2060	26.24287
2065	26.02621
2070	26.02606
2075	25.85397
2080	25.43156
2085	24.86587
2090	24.36293
2095	24.05405
2100	23.90299