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Note: These data are available in spreadsheet format by clicking the ''Download Series History'' link on the previous page (with drop-down menu bar at top).
View History:
Monthly
Annual
U.S. Dry Developmental Wells Drilled (Count)
Year
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
1973
330
336
380
291
355
344
365
421
359
397
405
385
1974
377
310
403
423
458
391
507
444
484
527
454
505
1975
515
408
456
482
500
542
526
599
649
685
599
556
1976
637
522
574
591
563
588
549
554
580
645
592
591
1977
540
517
642
620
660
630
655
747
640
710
691
650
1978
693
494
645
680
718
763
706
844
802
805
745
691
1979
655
526
665
572
689
675
668
802
771
936
844
859
1980
880
720
772
829
954
996
1,035
1,127
1,096
1,156
1,081
1,058
1981
1,291
1,021
1,188
1,172
1,306
1,328
1,356
1,452
1,360
1,407
1,307
1,365
1982
1,479
1,151
1,351
1,281
1,134
1,170
1,292
1,314
1,209
1,226
1,236
1,217
1983
1,300
1,086
1,170
975
1,004
1,114
1,187
1,284
1,176
1,368
1,297
1,179
1984
1,324
1,031
1,080
989
1,152
1,347
1,292
1,501
1,253
1,185
1,220
1,189
1985
1,149
869
1,129
1,100
1,023
1,016
1,102
1,146
982
1,014
798
929
1986
1,024
753
790
634
516
477
552
523
510
479
462
512
1987
462
390
414
481
491
470
559
565
564
645
520
554
1988
516
424
426
436
494
482
471
467
471
478
358
385
1989
329
224
311
389
336
375
379
408
395
417
376
363
1990
345
307
322
325
356
370
408
471
414
482
499
404
1991
343
390
384
385
369
391
411
362
360
409
342
346
1992
296
264
304
271
336
299
287
342
330
350
332
323
1993
291
276
266
318
388
325
427
334
403
336
328
312
1994
244
202
241
242
219
248
267
314
272
297
244
260
1995
208
264
205
224
246
285
275
284
263
260
251
275
1996
302
232
236
234
261
263
273
307
304
346
301
282
1997
292
287
263
309
288
333
359
349
323
331
331
312
1998
260
312
259
266
316
287
266
268
217
255
225
225
1999
189
154
137
150
169
189
187
234
238
226
222
242
2000
203
190
204
236
238
224
246
305
199
223
219
210
2001
246
209
201
214
248
255
230
270
215
249
200
179
2002
190
158
171
184
199
201
211
238
196
206
186
187
2003
185
168
162
216
202
203
203
234
229
245
192
183
2004
184
142
177
198
199
172
171
205
215
198
218
195
2005
190
143
220
195
280
258
248
282
220
225
225
219
2006
242
219
312
323
313
322
327
339
337
329
324
324
2007
324
327
332
334
333
336
337
345
341
340
351
352
2008
339
343
350
358
367
Updated on 7/1/2008
Source: U.S. Energy Information Administration
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