1982

Interpolated

185,263

192,982

0

0

192,982

23,085

23,085

1983

Micklewright, 1986

249,202

239,234

249,202

0

0

249,202

28,234

28,234

1984

301,697

289,629

301,697

0

0

301,697

34,534

34,534

1985

AWPI, 1997

328,677

315,530

328,677

0

0

328,677

41,773

41,773

1986

375,458

360,440

375,458

0

0

375,458

51,445

51,445

1987

418,984

402,225

418,984

0

0

418,984

63,613

63,613

1988

450,565

432,542

450,565

0

0

450,565

78,393

78,393

1989

406,941

390,663

406,941

0

0

406,941

94,324

94,324

1990

AWPI, 1997

437,675

420,168

437,675

0

0

437,675

114,509

114,509

1991

424,370

407,395

424,370

0

0

424,370

136,067

136,067

1992

Interpolated

447,437

429,540

447,437

0

0

447,437

160,079

160,079

1993

AWPI, 1997

470,504

451,684

470,504

0

0

470,504

184,636

184,636

1994

496,883

477,008

496,883

0

0

496,883

208,884

208,884

1995

450,596

432,572

450,596

0

0

450,596

230,578

230,578

1996

467,855

449,141

467,855

0

0

467,855

252,573

252,573

1997

Micklewright, 1998

581,382

558,127

581,382

0

0

581,382

275,709

275,709

1998

Calculated from 2005 survey of chemical suppliers (Table 3)

540,204

562,713

0

0

562,713

294,857

294,857

1999

588,427

612,944

0

0

612,944

314,037

314,037

2000

599,525

624,505

0

0

624,505

331,083

331,083

2001

571,134

594,931

0

0

594,931

346,856

346,856

2002

541,873

564,451

25,000

0

589,451

362,882

363,434

2003

505,603

526,670

50,000

0

576,670

379,233

380,336

2004

109,052

113,596

380,000

10,000

503,596

385,361

396,108

2005

85,000

427,500

10,000

522,500

401,985

413,395

2006

85,000

427,500

10,000

522,500

416,783

429,026

2007

Vlosky est 608m cf water-borne

85,000

475,000

10,000

570,000

426,453

443,728

2008

85,000

475,000

20,000

580,000

426,162

454,971

2009

85,000

475,000

20,000

580,000

414,072

463,347

2010

85,000

475,000

20,000

580,000

392,167

469,737

2011

85,000

475,000

25,000

585,000

363,831

475,216

2012

85,000

475,000

25,000

585,000

332,006

480,227

2013

85,000

475,000

25,000

585,000

298,752

485,067

2014

85,000

475,000

25,000

585,000

265,480

489,701

2015

2016 Survey Value

78,665

81,943

475,000

25,000

581,943

233,239

494,033