*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19758
19760
19770
19780
19792
19801
19810
19820
19830
19840
19850
19860
19870
19880
19890
199021
19916
199213
19932
199411
19959
199610
199710
19988
199913
200023
200116
20029
200326
200433
200522
20062
20074
200813
20094
20102
20119
201211
20130
20140
20150
20160
20170
Total288