1956

7.2

1999

7.6

1990

6.7

2007

6.1

1972

6.4

2022

6.0

1991

6.3

2009

6.2

2004

5.9

2000

5.7

1986

6.6

2011

5.9

2015

7.6

1997

5.4

2018

6.1

1973

6.9

2014

7.0

2007

6.1

1996

6.6

1993

4.3