Year	Percent
1950	12.32274
1955	13.60708
1960	14.02795
1965	13.80484
1970	10.99109
1975	8.92722
1980	8.71194
1985	8.27511
1990	7.88289
1995	7.40605
2000	6.93096
2005	6.61402
2010	6.31007
2015	6.10836
2020	5.90017
2025	5.73396
2030	5.60532
2035	5.52465
2040	5.48872
2045	5.47077
2050	5.44754
2055	5.4214
2060	5.38359
2065	5.35361
2070	5.32015
2075	5.29132
2080	5.25223
2085	5.20699
2090	5.16402
2095	5.12518
2100	5.09199