Hi Dick, thank you for the reference.
Why use a five year rolling average, rather than a simple yearly total?
For the years 1991 to 2001 I used Table 5, for 2000 to 2010 I used Table 4 from the respective publications.
I couldn't get the figures in your graph and are possibly missing something obvious.
There were some interesting stats there.
The drop in Agricultural hours from 106k to 20k in a 2002 was too great to be real, but I note that the rise in Aerial Work seems to match this suggests that over time maybe some flying hours has been reclassified from Ag to Airwork.
From 1991 to 2010 the figures show that Total GA flying has increased from 1755 to 1848 k hours. There are slight dips in this curve that appear to correlate to general economic activity.
Here are the figures I have:
Year Private Business Training Agriculture Aerialwork Testferry Charter TotalGA RegionalAirline TOTAL
1991 261.7 240.3 452.6 101.3 282.7 29.7 386.5 1,754.7 209.2 1,964.0
1992 255.4 204.2 421.6 80.9 256.7 28.2 403.9 1,651.0 223.4 1,874.4
1993 265.3 212.3 436.8 89.2 278.8 28.2 393.4 1,703.9 227.7 1,931.6
1994 256.9 198.5 419.5 78.9 301.7 25.9 424.4 1,705.7 238.3 1,944.0
1995 251.0 189.1 430.6 94.5 302.4 28.2 465.7 1,761.3 243.1 2,004.4
1996 261.6 182.8 444.9 117.4 285.7 26.2 480.4 1,799.0 246.2 2,045.2
1997 266.7 176.0 449.5 128.4 307.4 27.6 483.7 1,839.3 272.4 2,111.7
1998 263.0 163.8 478.5 139.2 312.4 26.6 494.6 1,877.9 273.2 2,151.1
1999 275.9 153.3 448.8 126.3 306.6 26.6 504.6 1,842.2 277.3 2,119.4
2000 248.5 136.3 413.6 115.0 296.9 27.9 476.7 1,714.8 335.7 2,050.6
2001 261.7 144.9 406.2 106.7 294.2 23.2 466.0 1,702.9 298.0 2,000.9
2002 270.2 142.2 410.8 20.9 327.1 70.8 445.7 1 687.7 250.1 1 937.8
2003 239.7 143.4 420.3 21.2 322.5 69.7 429.2 1 645.9 234.7 1 880.6
2004 247.2 143.0 352.2 22.3 312.4 86.5 481.4 1 645.0 251.4 1 896.3
2005 239.2 149.1 415.8 22.3 318.8 95.0 482.6 1 722.8 254.7 1 977.5
2006 227.2 144.1 424.0 21.7 337.9 61.7 478.4 1 695.0 241.5 1 936.4
2007 222.7 153.4 455.4 25.7 368.0 62.1 544.5 1 831.8 241.9 2 073.8
2008 228.4 151.7 485.6 21.8 373.4 78.2 518.6 1 857.7 214.7 2 072.4
2009 239.5 148.5 497.1 16.4 363.1 73.3 469.7 1 807.5 204.1 2 011.5
2010 241.9 140.0 436.3 18.2 400.3 103.8 507.3 1 847.7 228.1 2 075.9