*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
197228
19732
19740
19750
19760
19770
19780
19790
19801
19810
19820
19830
198414
198513
198618
198717
198843
19898
199030
199170
199211
19936
19943
19959
199622
199713
19982
199932
200028
20019
20027
20031
20040
20050
20062
20071
20086
20090
20106
20113
20122
20131
20143
20151
20166
20171
20180
Total419