How to get lines of code removed from a git repository

# This script pulls a rough estimate of LOC (lines of code) changes for a given year

$ExecutingDirectory = (Get-Location).Path
$Year = (Get-Date).Year
$BeginningOfYear = "$($Year)-01-01"
$Commits = git --no-pager log --since="$BeginningOfYear" --oneline
$Lines = ($Commits | Measure-Object -Line).Lines

$Result = git diff --shortstat "HEAD~$Lines" HEAD 2>&1 # pipe any errors to the success stream so we can search the output below
# For a more accurate count, you may need to filter your commits to specific
# folders (ie. the source folder) of your repository. If so, you may want a
# line something similar to what is below. There are two places where you will
# need to uncomment this line 
# $Result = git diff --shortstat --relative=src/ "HEAD~$Lines" HEAD 2>&1 


# If we have a new repository that was created during this year, our git log
# command will return an error. The solution is to reduce the lines by 1 and 
# re-run the git diff command
if ($Result | Select-String -Pattern ".*path not in the working tree.*") {
    $Lines = $Lines - 1;

    $Result = git diff --shortstat "HEAD~$Lines" HEAD 2>&1    
    # $Result = git diff --shortstat --relative=src/ "HEAD~$Lines" HEAD 2>&1 
}

"Repo at '$($ExecutingDirectory)' stats for $($Year):$($Result)"