diff --git a/app.rb b/app.rb
index 5edd2b53..5004f024 100644
--- a/app.rb
+++ b/app.rb
@@ -27,15 +27,16 @@ class LedgerRbApp < Sinatra::Base
     Ledger.accounts( params[ :depth ] ).to_json
   end
 
-  get '/api/ledger/monthly/?' do
+  get '/api/ledger/register/:period/?' do
     content_type :json
+    param :period, String, required: true       # TODO: restrict possible values to [ 'yearly', 'monthly' ]
     param :categories, Array, default: Ledger.accounts( 1 )
 
     params[ :categories ].map do
       |category|
       cat = category.first
       { category: cat,
-        data: Ledger.monthly_register( cat ) }
+        data: Ledger.register( cat, "--#{params[ :period ]}" ) }
     end.to_json
   end
 
diff --git a/lib/ledger.rb b/lib/ledger.rb
index deabb481..7921ce0c 100644
--- a/lib/ledger.rb
+++ b/lib/ledger.rb
@@ -29,15 +29,23 @@ module Ledger
     run '', 'cleared'
   end
 
-  def monthly_register( category )
-    run( "--monthly --collapse --amount-data --exchange '€'", 'register', "#{category}" )
+  def register( category, options='' )
+    run( "#{options} --collapse --amount-data --exchange '€'", 'register', "#{category}" )
       .split( "\n" )
       .map do |line|
       line_array = line.split
 
       { date: line_array[ 0 ],
         amount: line_array[ 1 ].to_f }
-      end
+    end
+  end
+
+  def monthly_register( category )
+    register category, "--monthly"
+  end
+
+  def yearly_register( category )
+    register category, "--yearly"
   end
 
   def balance( period = nil )