1993

6.2

2000

5.7

1983

6.6

1989

4.5

1980

7.5

2014

6.3

1973

3.7

2012

5.8

1986

4.0

2007

5.8

2019

7.6

1982

4.9

1999

3.4

1999

5.2

1996

4.7

1997

4.8

2002

5.3

2005

3.7

1999

5.8

2013

7.0