Year	Percent
1950	15.58421
1955	13.66077
1960	13.32878
1965	11.16769
1970	8.21409
1975	8.51612
1980	9.13519
1985	8.53986
1990	7.83599
1995	7.11292
2000	6.41857
2005	5.17276
2010	4.97671
2015	5.15149
2020	5.10129
2025	5.03071
2030	4.78783
2035	4.47492
2040	4.29539
2045	4.3339
2050	4.47909
2055	4.57914
2060	4.56772
2065	4.48104
2070	4.39823
2075	4.40627
2080	4.50437
2085	4.62345
2090	4.67885
2095	4.65631
2100	4.58898