Year	Percent
1950	12.3095
1955	14.12906
1960	15.44802
1965	15.22649
1970	15.54731
1975	13.84607
1980	13.02762
1985	12.62306
1990	12.43508
1995	11.96776
2000	11.17252
2005	10.52033
2010	9.35628
2015	8.09041
2020	7.82748
2025	7.72978
2030	7.47812
2035	6.94764
2040	6.3193
2045	5.83541
2050	5.59669
2055	5.54423
2060	5.5091
2065	5.38329
2070	5.18685
2075	5.00512
2080	4.9094
2085	4.90983
2090	4.94468
2095	4.93931
2100	4.87581