Year	Percent
1950	27.4128
1955	27.39378
1960	24.16772
1965	21.49294
1970	20.65392
1975	21.6201
1980	26.0851
1985	27.78208
1990	27.59693
1995	27.68008
2000	27.73748
2005	29.77822
2010	32.01998
2015	31.26208
2020	29.38901
2025	27.30031
2030	26.03864
2035	26.27707
2040	26.51289
2045	25.75933
2050	24.3532
2055	23.53024
2060	23.30117
2065	23.64443
2070	24.03456
2075	24.07427
2080	23.75466
2085	23.28384
2090	22.96265
2095	22.89657
2100	22.96431