Question: The manufacturing conglomerate that Steyr Mannlicher was originally a part of was broken up in stages between which years?

Context paragraphs:
Steyr Mannlicher: Steyr Mannlicher is a firearms manufacturer based in Sankt Ulrich bei Steyr, Austria.  Originally part of Steyr-Daimler-Puch, it became independent when the conglomerate was broken up in 1989.

Steyr-Daimler-Puch: Steyr-Daimler-Puch was a large manufacturing conglomerate based in Steyr, Austria, which was broken up in stages between 1987 and 2001.  The component parts and operations continued to exist under separate ownership and new names.

7.65×21mm Mannlicher: The 7.63 mm Mannlicher or 7.65 mm Mannlicher is a centerfire pistol cartridge developed for the Steyr Mannlicher M1901 pistol.  This military pistol was rejected by the Austrian Ministry of War, but was often carried as a private weapon by officers.  England began manufacturing ammunition when the Mannlicher pistol became popular in South America.  Germany began manufacturing ammunition after World War I, but identified the ammunition as 7.65 Mannlicher to differentiate it from the 7.63×25mm Mauser cartridge.  This cartridge headspaces on the mouth of the case.

Steyr M: The Steyr M is a series of semi-automatic pistols developed by Steyr Mannlicher GmbH & Co KG of Austria for police services and the civilian shooting market.  Design work on the new pistol began in the early 1990s and the final product known as the M9 (adapted to fire the 9×19mm Parabellum cartridge) was officially unveiled in the spring of 1999.  The M40 version chambered in .40 S&W was developed before the M9, followed later by the M357 (caliber .357 SIG or 9×22mm) and two smaller variants of the M9 and M40 designated the S9 and S40 respectively.  These pistols were developed primarily for concealed carry and have a shortened barrel, slide, smaller frame and a reduced magazine capacity.  In 2013 the Steyr M (Medium) and S (Small) form factors were complemented by the L (Large) sized series and the C (Compact) sized series both available in 9×19mm Parabellum and .40 S&W chamberings as the L9-A1, L40-A1, C9-A1 and C40-A1.

Mannlicher M1905: The Modelo 1905 is a pistol designed by Ferdinand Ritter von Mannlicher in 1899 and originally produced in Austria as the Mannlicher Model 1901.  The Mannlicher Model 1901 was an improved version of the Model 1900, both of which were produced by Osterreichische Waffenfabrik Steyr (commonly known as Steyr).  All of these models have the same basic design and operation, but minimal adjustments were made to improve each of them.  The Modelo 1905 is the version of the Model 1901 that the Argentine Army purchased from Steyr in 1905.  This semi-automatic pistol has a unique and elegant appearance due to the curve of the handgrip.  It is single action and uses a blowback operation system to reload.  Like its predecessors, the Modelo 1905 has a non-detachable magazine that can be loaded from the top with a stripper clip.

Steyr M1912: The Steyr M1912, also known as the Steyr-Hahn, is a semi-automatic pistol developed in 1911 by the Austrian firm Steyr Mannlicher and designed by Karel Krnka, based on the mechanism of the Roth–Steyr M1907.  It was developed for the Austro-Hungarian Army and adopted in 1912 as the M1912.  It was in service in a limited capacity for the Wehrmacht until the end of World War II.

Mannlicher–Schönauer: The Mannlicher–Schönauer (sometimes Anglicized as "Mannlicher Schoenauer," Hellenized as Τυφέκιον Μάνλιχερ or Όπλον Μάνλιχερ-Σενάουερ) is a type of rotary-magazine bolt-action rifle produced by Steyr Mannlicher for the Greek Army in 1903 and later was also used in small numbers by the Austro-Hungarian armies.  Post war use was for civilian use such as hunting and target practice.

Steyr SSG 08: The Steyr SSG 08 (German: Scharfschützengewehr 2008, English: Sniper Rifle 08) is a modern bolt-action sniper rifle developed and produced by Steyr Mannlicher in Austria.  The rifle is a further evolution of the SSG 04 sniper rifle, also developed and produced by Steyr.

Steyr Scout: The Steyr Scout is a modern scoped bolt-action rifle manufactured by Steyr Mannlicher and chambered primarily for 7.62 NATO (.308 Winchester), although other chamberings are offered commercially.  It is intended to fill the role of a versatile, lightweight all-around rifle as specified in Jeff Cooper's scout rifle concept.  Apart from the barrel and action, it is made primarily of polymers and is designed to be accurate to at least 300–400 meters.  The Steyr Scout is also available in 5.56 NATO (.223 Remington), .243 Winchester, .376 Steyr and 7mm-08 Remington.

Steyr SSG 04: The Steyr SSG 04 (German: Scharfschützengewehr 2004, English: Sniper Rifle 04) is a modern bolt action sniper rifle developed and produced by Steyr Mannlicher in Austria, as a complement to Steyr's SSG 69, using the same Safe Bolt System (SBS) action developed for Steyr's hunting rifles.  It is also the basis for the Steyr SSG 08 and Steyr SSG Carbon.

Supporting paragraphs: Steyr Mannlicher Steyr-Daimler-Puch
Answer: 1987 and 2001