*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19732
19744
19750
19760
19770
19781
19790
19804
19813
19825
19838
19845
19857
19869
198714
198817
198914
199023
199114
199213
19939
199419
199511
199616
199716
199821
199923
200022
200119
200219
200323
200427
200523
200624
200739
200832
200953
201054
201147
201231
201341
201451
201550
20169
20170
20180
Total823