get hashtable of EC2 instance type history from https://instancetyp.es.

Get-EC2InstanceTypeHistory.ps1

$timeline = Invoke-RestMethod -Method Get https://instancetyp.es/timeline.json
$releases = $timeline.instances | ForEach-Object {
    [pscustomobject]@{
        instanceType = ($_.instance_type -split '\.')[0]
        releaseYear = $_.release_year
    }
} | Group-Object -Property instanceType | ForEach-Object {
    $_.Group[0]
} | Group-Object -Property releaseYear

2000..((Get-Date).Year) | ForEach-Object -Begin { $ret = @{} } -Process {
    $year = $_
    $release = $releases | Where-Object -Property Name -EQ $year
    $instanceType = ($release.Group | ForEach-Object { $_.instanceType }) -join ','
    $ret[$year] = $instanceType
} -End { $ret }