1991

5.6

1999

6.6

1988

7.5

2012

5.5

1985

5.8

1981

5.7

1984

5.9

1995

5.2

2004

5.8

1988

7.0

1987

4.6

2009

4.3

2006

3.5

1994

5.4

2002

7.9

1979

6.6

1996

6.9

2017

5.0

1997

5.3

1981

7.0

2009

7.1

2012

7.1

2014

8.2

2024

10.0

1986

5.0

2016

2.6

2013

6.5

2006

5.8

1982

5.7

1980

6.4

2020

5.3

2004

2.0