1976

6.980 km

1977

12.141 km

1978

7.986 km

1979

11.169 km

1980

Keine Statistik

1981

6.000 km

1982

14.000 km

1983

15.559 km

1984

12.112 km

1985

17.683 km

1986

20.781 km

1987

14.910 km

1988

13.638 km

1989

11.164 km

1990

13.024 km

1991

10.711 km

1992

10.974 km

1993

8.927 km

1994

12.156 km

1995

11.921 km

1996

7.803 km

1997

11.744 km

1998

8.888 km

1999

7.580 km

2000

13.706 km

2001

12.482 km

2002

18.253 km

2003

15.464 km

2004

18.279 km

2005

17.484 km

2006

17.747 km

2007

21.360 km

2008

19.749 km

2009

22.035 km

2010

19.067 km

2011

21.353 km

2012

21.390 km

2013

20.905 km

2014

15.414 km

2015

21.567 km

2016

15.508 km

2017

16.073 km

2018

22.674 km

2019

15.981 km

2020

15.957 km

2021

13.723 km

2022

13.742 km

2023

13.724 km