1964

6.1

1991

6.2

1990

6.2

2005

7.4

1959

6.7

1965

5.8

1968

5.5

1966

5.6

2001

6.4

2008

5.5

2021

5.5

1965

4.8

1989

7.3

1985

6.6

1989

7.7

2023

6.4

1963

5.8

1984

7.1

1966

6.5

1999

6.9