Year	Percent
1950	11.46069
1955	11.5205
1960	12.56758
1965	13.35038
1970	13.38233
1975	13.85628
1980	13.55472
1985	11.68941
1990	11.62669
1995	11.53336
2000	10.90248
2005	10.24294
2010	9.24392
2015	8.74772
2020	8.03654
2025	7.42179
2030	6.95278
2035	6.51091
2040	6.17002
2045	5.89757
2050	5.68136
2055	5.51236
2060	5.36499
2065	5.24452
2070	5.14533
2075	5.07429
2080	5.02602
2085	4.99718
2090	4.97039
2095	4.95442
2100	4.93946