Year	Percent
1950	17.26248
1955	18.20295
1960	18.59334
1965	18.87144
1970	21.06268
1975	19.30894
1980	20.90237
1985	19.29219
1990	17.74076
1995	13.98087
2000	12.69877
2005	10.71552
2010	10.01132
2015	9.36651
2020	7.66608
2025	6.74171
2030	6.45654
2035	6.3887
2040	6.20248
2045	5.86732
2050	5.55986
2055	5.39649
2060	5.33989
2065	5.33019
2070	5.30061
2075	5.25298
2080	5.18715
2085	5.14777
2090	5.12684
2095	5.11546
2100	5.10046