No chart image found

*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
197213
19732
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19872
198810
19894
19904
199122
19920
199331
199431
1995118
199685
1997112
19983
1999103
200014
20016
200217
20039
20040
20054
20062
20072
20082
20097
20102
20110
20124
20130
20142
20157
20164
20171
20180
20191
20200
20210
Total625