*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19781
19790
19800
19810
19820
19830
19840
19850
19865
19873
198810
198921
199015
199111
199228
199354
199444
199584
199620
199747
199861
199926
200027
200118
200217
20039
200411
200570
20066
200718
200812
200916
20101
20112
20120
20131
20141
20150
20165
20171
20180
Total646