*Excludes Observations that spanned multiple years

Pre 19700
19701
19710
19720
19730
19741
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
19860
19874
198820
19898
19908
199111
199218
199324
199427
199535
199632
199756
199816
19997
200013
200113
20022
200316
200414
20057
20066
20073
20086
200911
20109
201113
20123
20130
20145
20150
20161
20170
Total391