mozilla/metrics-graphics

[
  {
    "year": "1945",
    "sightings": 6
  },
  {
    "year": "1946",
    "sightings": 8
  },
  {
    "year": "1947",
    "sightings": 34
  },
  {
    "year": "1948",
    "sightings": 8
  },
  {
    "year": "1949",
    "sightings": 15
  },
  {
    "year": "1950",
    "sightings": 25
  },
  {
    "year": "1951",
    "sightings": 20
  },
  {
    "year": "1952",
    "sightings": 48
  },
  {
    "year": "1953",
    "sightings": 34
  },
  {
    "year": "1954",
    "sightings": 50
  },
  {
    "year": "1955",
    "sightings": 31
  },
  {
    "year": "1956",
    "sightings": 38
  },
  {
    "year": "1957",
    "sightings": 67
  },
  {
    "year": "1958",
    "sightings": 40
  },
  {
    "year": "1959",
    "sightings": 47
  },
  {
    "year": "1960",
    "sightings": 64
  },
  {
    "year": "1961",
    "sightings": 39
  },
  {
    "year": "1962",
    "sightings": 55
  },
  {
    "year": "1963",
    "sightings": 75
  },
  {
    "year": "1964",
    "sightings": 77
  },
  {
    "year": "1965",
    "sightings": 167
  },
  {
    "year": "1966",
    "sightings": 169
  },
  {
    "year": "1967",
    "sightings": 178
  },
  {
    "year": "1968",
    "sightings": 183
  },
  {
    "year": "1969",
    "sightings": 138
  },
  {
    "year": "1970",
    "sightings": 126
  },
  {
    "year": "1971",
    "sightings": 110
  },
  {
    "year": "1972",
    "sightings": 146
  },
  {
    "year": "1973",
    "sightings": 209
  },
  {
    "year": "1974",
    "sightings": 241
  },
  {
    "year": "1975",
    "sightings": 279
  },
  {
    "year": "1976",
    "sightings": 246
  },
  {
    "year": "1977",
    "sightings": 239
  },
  {
    "year": "1978",
    "sightings": 301
  },
  {
    "year": "1979",
    "sightings": 221
  },
  {
    "year": "1980",
    "sightings": 211
  },
  {
    "year": "1981",
    "sightings": 146
  },
  {
    "year": "1982",
    "sightings": 182
  },
  {
    "year": "1983",
    "sightings": 132
  },
  {
    "year": "1984",
    "sightings": 172
  },
  {
    "year": "1985",
    "sightings": 192
  },
  {
    "year": "1986",
    "sightings": 173
  },
  {
    "year": "1987",
    "sightings": 193
  },
  {
    "year": "1988",
    "sightings": 203
  },
  {
    "year": "1989",
    "sightings": 220
  },
  {
    "year": "1990",
    "sightings": 217
  },
  {
    "year": "1991",
    "sightings": 210
  },
  {
    "year": "1992",
    "sightings": 228
  },
  {
    "year": "1993",
    "sightings": 285
  },
  {
    "year": "1994",
    "sightings": 381
  },
  {
    "year": "1995",
    "sightings": 1336
  },
  {
    "year": "1996",
    "sightings": 862
  },
  {
    "year": "1997",
    "sightings": 1248
  },
  {
    "year": "1998",
    "sightings": 1812
  },
  {
    "year": "1999",
    "sightings": 2906
  },
  {
    "year": "2000",
    "sightings": 2780
  },
  {
    "year": "2001",
    "sightings": 3105
  },
  {
    "year": "2002",
    "sightings": 3176
  },
  {
    "year": "2003",
    "sightings": 3896
  },
  {
    "year": "2004",
    "sightings": 4208
  },
  {
    "year": "2005",
    "sightings": 3996
  },
  {
    "year": "2006",
    "sightings": 3590
  },
  {
    "year": "2007",
    "sightings": 4195
  },
  {
    "year": "2008",
    "sightings": 4705
  },
  {
    "year": "2009",
    "sightings": 4297
  },
  {
    "year": "2010",
    "sightings": 2531
  }
]