*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19821
19830
19840
19851
19860
19876
198833
19890
19906
19919
199210
199351
19945
19952
19963
19975
19983
19994
20000
20010
20020
20032
20041
20051
20061
20070
20083
20092
20106
20111
20120
20136
20142
20152
20164
201724
20187
20199
20209
20210
20226
20231
20240
Total228