( 1 )

1960-1961

2,540

2,040

3,320

1970-1971

2,007

1,773

2,588

1980-1981

1,895

1,700

2,562

1990

1,892

1,698

2,600

1995

1,337

1,193

1,813

2000

1,195

1,089

1,554

2001

1,223

1,124

1,564

2002

1,286

1,189

1,633

2003

1,319

1,223

1,666

2004

1,340

1,247

1,665

2005

1,287

1,197

1,589

2006

1,296

1,199

1,611

2007

1,406

1,283

1,798

2008

1,494

1,366

1,894