Year	Percent
1950	13.0104
1955	13.03645
1960	12.64467
1965	13.84609
1970	14.53094
1975	14.92341
1980	14.39328
1985	14.5045
1990	14.15024
1995	13.39199
2000	12.31686
2005	11.55171
2010	10.98409
2015	9.86343
2020	9.05397
2025	8.41302
2030	7.77062
2035	7.1626
2040	6.60495
2045	6.14609
2050	5.81192
2055	5.54193
2060	5.31342
2065	5.12363
2070	4.9673
2075	4.85131
2080	4.76364
2085	4.70432
2090	4.66825
2095	4.64471
2100	4.63447