Table 6. Private sector employment by establishment age Mining, Quarrying, and Oil and Gas Extraction Age Class March 1994 March 1995 March 1996 March 1997 March 1998 March 1999 Less than one year 21,067 23,286 18,139 21,754 21,675 21,865 1 year _ 19,406 25,861 18,229 22,227 19,413 2 years _ _ 19,294 27,152 16,415 18,778 3 years _ _ _ 18,390 27,731 14,751 4 years _ _ _ _ 18,053 24,170 5 years _ _ _ _ _ 15,734 6 years _ _ _ _ _ _ 7 years _ _ _ _ _ _ 8 years _ _ _ _ _ _ 9 years _ _ _ _ _ _ 10 years _ _ _ _ _ _ 11 years _ _ _ _ _ _ 12 years _ _ _ _ _ _ 13 years _ _ _ _ _ _ 14 years _ _ _ _ _ _ 15 years _ _ _ _ _ _ 16 years _ _ _ _ _ _ 17 years _ _ _ _ _ _ 18 years _ _ _ _ _ _ Born before March 1993 539,583 505,621 482,189 474,175 464,756 404,068 Total 560,650 548,313 545,483 559,700 570,857 518,779 Age Class March 2000 March 2001 March 2002 March 2003 March 2004 March 2005 Less than one year 19,186 16,343 16,328 13,494 14,740 15,579 1 year 18,205 22,363 16,266 15,164 13,655 17,193 2 years 16,943 19,467 21,364 15,226 16,196 13,347 3 years 16,486 18,718 17,518 18,934 16,186 17,654 4 years 13,972 17,141 16,204 16,502 19,643 16,957 5 years 18,551 13,520 15,901 15,632 17,873 19,374 6 years 14,988 16,540 11,565 14,717 15,003 17,534 7 years _ 14,240 15,190 11,000 14,808 18,323 8 years _ _ 14,546 14,000 10,999 15,448 9 years _ _ _ 13,276 13,868 11,039 10 years _ _ _ _ 13,123 14,546 11 years _ _ _ _ _ 12,984 12 years _ _ _ _ _ _ 13 years _ _ _ _ _ _ 14 years _ _ _ _ _ _ 15 years _ _ _ _ _ _ 16 years _ _ _ _ _ _ 17 years _ _ _ _ _ _ 18 years _ _ _ _ _ _ Born before March 1993 379,521 384,402 360,930 339,775 337,086 345,757 Total 497,852 522,734 505,812 487,720 503,180 535,735 Age Class March 2006 March 2007 March 2008 March 2009 March 2010 March 2011 Less than one year 17,999 23,662 20,257 17,793 13,588 18,555 1 year 19,105 21,855 29,278 20,904 18,400 20,047 2 years 20,600 20,904 23,605 25,260 19,069 22,559 3 years 14,096 22,567 21,822 20,066 21,349 21,640 4 years 20,304 15,067 23,776 19,636 17,927 24,648 5 years 19,167 21,189 15,820 23,036 16,438 19,898 6 years 20,138 19,564 20,723 14,330 19,578 17,327 7 years 17,666 21,296 20,165 19,766 13,714 21,523 8 years 18,474 18,384 22,098 18,158 16,814 15,030 9 years 16,619 20,213 19,929 21,038 15,743 18,059 10 years 11,453 16,880 20,293 19,068 17,914 16,705 11 years 15,009 11,952 17,124 18,973 16,899 19,168 12 years 13,848 15,971 12,033 15,809 17,938 17,923 13 years _ 14,579 16,402 10,947 14,046 19,210 14 years _ _ 16,037 15,870 9,950 15,883 15 years _ _ _ 14,860 14,941 9,934 16 years _ _ _ _ 13,249 16,105 17 years _ _ _ _ _ 13,243 18 years _ _ _ _ _ _ Born before March 1993 367,705 376,468 383,875 370,592 342,538 362,816 Total 592,183 640,551 683,237 666,106 620,095 690,273 Age Class March 2012 Less than one year 23,038 1 year 25,751 2 years 24,888 3 years 25,553 4 years 26,561 5 years 27,621 6 years 22,119 7 years 19,537 8 years 23,715 9 years 16,992 10 years 20,019 11 years 18,086 12 years 20,080 13 years 19,161 14 years 20,934 15 years 17,548 16 years 10,364 17 years 17,587 18 years 13,873 Born before March 1993 393,124 Total 786,551 NOTE: A '_' indicates that the data are not available and a 'N' indicates that the data do not meet BLS disclosure standards.