*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19792
19800
19810
19820
19830
19840
19850
19862
19870
198813
19892
199025
19918
19924
199317
19941
199511
19962
19973
19980
19992
20001
20010
200214
20030
20041
20052
20060
20071
20085
20097
20100
20112
20120
20133
20140
20150
20163
20174
20182
201910
20201
Total148