1997

7.8

1993

6.0

1968

6.4

1997

5.7

2015

6.5

1984

6.1

2008

6.7

1987

7.3

2005

7.4

1966

8.5

2009

7.5

2019

7.6

2007

7.1

2007

5.0

2019

5.4

2003

6.2

2008

6.4

1981

5.8

2021

6.7

1969

7.3