Year	Percent
1950	10.76609
1955	10.25394
1960	9.82285
1965	8.93073
1970	11.33303
1975	11.65286
1980	10.77251
1985	10.57135
1990	11.03674
1995	11.49308
2000	11.89694
2005	11.57526
2010	10.79327
2015	9.9213
2020	9.10345
2025	8.7216
2030	8.17021
2035	7.62311
2040	7.03462
2045	6.53656
2050	6.12195
2055	5.80332
2060	5.53754
2065	5.30807
2070	5.11827
2075	4.95529
2080	4.84309
2085	4.76269
2090	4.7041
2095	4.66886
2100	4.63693