2004

7.3

2010

6.8

2009

7.6

2004

6.0

2015

6.7

1993

7.0

2019

5.6

2007

5.7

1990

7.5

1989

5.0

1982

5.2

1986

6.2

1995

7.4

1980

8.4

1985

6.2

1985

5.3

2020

6.4

2009

6.1

2009

6.1

1991

6.8