Year	Percent
1950	20.21561
1955	21.29548
1960	20.14487
1965	19.33348
1970	18.37717
1975	21.741
1980	24.08596
1985	30.19201
1990	27.49448
1995	29.10415
2000	29.59498
2005	31.4178
2010	35.30098
2015	36.00515
2020	35.35725
2025	32.48674
2030	29.42115
2035	28.64826
2040	28.55039
2045	28.51084
2050	27.17761
2055	25.1802
2060	23.47861
2065	22.64072
2070	22.50861
2075	22.43476
2080	21.88916
2085	20.98048
2090	20.16553
2095	19.77684
2100	19.78738