{ year 1999 }
{ year 2000 { month feb } }
{ year 2002 { month jun (1 0 60.1) } { month feb (1 1 14) (2 2 15.4) } }
{ year 2017
    { month feb (1 1 18) (2 3 26.66) (3 0 7.2) }
    { month dec (15 15 -19.2) (15 16 -18.8) (15 20 -2) }
}