1990

7.2

2007

5.2

1958

7.1

2004

5.7

1997

7.5

2015

5.9

2005

5.5

1989

6.3

1976

6.0

2010

6.4

1992

5.7

2012

5.8

1989

5.9

2012

6.9

1997

5.7

1990

6.1

2009

6.9

2000

4.9

1995

5.4

1984

6.5