*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19740
19752
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19908
19918
199218
19933
199410
199512
199614
19975
19988
19998
200015
20014
20023
200321
200418
200522
200610
20075
200821
20095
20102
20110
20125
20130
20140
20150
20160
20170
Total228