Year	Percent
1950	28.78015
1955	31.46373
1960	32.62874
1965	31.59216
1970	27.09816
1975	24.50135
1980	23.42772
1985	23.93573
1990	24.9365
1995	26.5493
2000	28.43101
2005	35.02333
2010	40.9631
2015	44.47865
2020	43.22861
2025	37.85356
2030	31.41905
2035	27.90489
2040	27.13466
2045	26.9348
2050	25.72883
2055	23.44226
2060	21.58266
2065	20.83988
2070	21.02108
2075	21.3922
2080	21.36153
2085	20.87513
2090	20.33888
2095	20.1264
2100	20.25688