Year	Percent
1950	9.69717
1955	7.02975
1960	5.71038
1965	5.3669
1970	5.53898
1975	5.99834
1980	6.49159
1985	7.01912
1990	8.19268
1995	8.65994
2000	8.90213
2005	9.72287
2010	10.76859
2015	12.81286
2020	15.11971
2025	17.44554
2030	19.67312
2035	21.61526
2040	23.81423
2045	25.32846
2050	26.12572
2055	27.03644
2060	28.1178
2065	29.74202
2070	31.72307
2075	33.29211
2080	34.54223
2085	35.4314
2090	36.1463
2095	36.8939
2100	37.63834