Year	Percent
1950	17.14148
1955	16.47983
1960	13.98783
1965	12.87678
1970	14.28615
1975	17.19116
1980	21.02081
1985	21.22879
1990	21.917
1995	23.99547
2000	24.86674
2005	28.43565
2010	29.56083
2015	29.56289
2020	28.94082
2025	28.17857
2030	28.7888
2035	29.04362
2040	29.45153
2045	28.13634
2050	26.58804
2055	24.91429
2060	23.19465
2065	23.40479
2070	23.60229
2075	23.75286
2080	23.53687
2085	23.01925
2090	22.59581
2095	22.58095
2100	22.83921