1985

7.7

1996

6.4

1994

8.3

1982

7.1

1994

6.7

2006

6.4

2002

5.4

1987

7.3

2006

5.8

2007

5.3

2006

5.2

2005

6.9

1992

7.2

2018

6.8

1995

7.7

1977

7.1

1986

6.6

1990

6.1

2017

5.4

2014

6.9