1991

5.3

1993

4.8

2003

5.3

1970

7.0

2010

7.3

1955

7.2

2006

4.1

2009

6.7

2015

5.3

1999

5.6

2021

7.8

1986

7.0

1997

6.1

1996

6.6

1966

6.0

1961

6.9

1995

4.6

1987

5.5

2013

5.8

1990

6.5