*Excludes Observations that spanned multiple years

Pre 19702
19701
19710
19720
19730
19740
19750
19760
19770
19780
19791
19800
19811
19820
19830
19842
19850
19863
198717
19883
19899
199027
1991119
199232
199312
19948
199519
199645
199742
19984
19999
20003
200111
20023
20032
20042
20053
20067
20071
20082
20092
201012
201141
20125
201352
201478
201570
201668
201728
201880
201943
20200
Total869