Year	Percent
1950	29.64949
1955	29.72203
1960	29.38354
1965	29.14498
1970	29.31295
1975	29.4974
1980	33.04463
1985	32.75517
1990	32.76023
1995	32.0996
2000	22.80718
2005	23.95108
2010	25.32951
2015	24.24267
2020	27.48118
2025	28.54483
2030	30.30277
2035	31.65394
2040	31.42433
2045	31.94748
2050	32.13421
2055	32.06249
2060	31.88779
2065	31.39442
2070	30.67477
2075	29.9359
2080	29.25335
2085	28.63128
2090	28.00213
2095	27.29973
2100	26.55878