Year	Percent
1950	16.88998
1955	17.8852
1960	15.76587
1965	14.44131
1970	16.33227
1975	17.70932
1980	20.88697
1985	19.57773
1990	18.31847
1995	19.72722
2000	22.08769
2005	26.66616
2010	27.54739
2015	27.0495
2020	25.68008
2025	26.28262
2030	29.34017
2035	31.53529
2040	30.38677
2045	27.3408
2050	24.40918
2055	23.1812
2060	24.09217
2065	24.75466
2070	23.87279
2075	22.37712
2080	21.64336
2085	21.83425
2090	22.47049
2095	22.85489
2100	22.60392