1995

6.9

1997

7.5

2019

6.5

1975

7.2

2000

6.1

1999

6.8

2002

6.6

1989

6.2

2003

6.4

2006

5.4

2005

6.1

2006

6.2

2003

6.3

1955

6.3

1986

6.1

2014

5.6

1995

6.4

1993

7.0

2000

5.2

1995

7.4