Year	Percent
1950	14.39449
1955	16.2667
1960	16.20631
1965	16.01769
1970	15.59777
1975	15.23978
1980	14.84278
1985	14.70586
1990	13.95514
1995	12.95091
2000	12.11784
2005	11.3257
2010	10.43757
2015	9.27504
2020	8.75937
2025	8.25282
2030	7.76958
2035	7.25251
2040	6.75925
2045	6.38089
2050	6.11092
2055	5.88407
2060	5.6691
2065	5.47586
2070	5.31258
2075	5.18779
2080	5.09855
2085	5.03192
2090	4.96404
2095	4.90116
2100	4.85072